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Is a beginningless model of spacetime true?

Open the strongest case, cross-examine every claim, and follow each reply until the reasoning reaches bedrock.

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01 Clarifying the question

On some models, spacetime has no beginning. This is usually either because it extends infinitely into the past or because time deconstructed in some sense. Is one of these models which lack a beginning true?

No Reasons challenging the proposition Is a beginningless model of spacetime true?
Yes Reasons affirming the proposition Is a beginningless model of spacetime true?